I'm a college student who lives off my brother and his wife, who are serious and hardworking. I'm determined to pass my entrance exams this year, but I've been feeling some inappropriate feelings for my kind and beautiful wife. One day, my brother went on a three-day business trip. I was left alone with my wife for 72 hours. I let out all the emotions I'd been holding back, and during the three days he was away, I had sex with her without taking a break from sleep.